Scoped IPv6 address

IPv6 has address scopes
Link-local, site-local

Need to identify "which scope we are using" to disambiguate
sin6_scope_id

Do not try to fill sin6_scope_id by yourself - it is implementation-dependent
getpeername, getsockname, getaddrinfo
What if i'm sitting on scope boundary?
big debate going on in ipngwg

Textual representation: fe80::1%de0
But you need to use hostnames!